include/wx/msw/private/button.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/private/button.h
   3 // Purpose:     helper functions used with native BUTTON control
   4 // Author:      Vadim Zeitlin
   5 // Created:     2008-06-07
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2008 Vadim Zeitlin <vadim@wxwidgets.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_MSW_PRIVATE_BUTTON_H_
  12 #define _WX_MSW_PRIVATE_BUTTON_H_
  13
  14 namespace wxMSWButton
  15 {
  16
  17 // returns BS_MULTILINE if the label contains new lines or 0 otherwise
  18 inline int GetMultilineStyle(const wxString& label)
  19 {
  20     return label.find(_T('\n')) == wxString::npos ? 0 : BS_MULTILINE;
  21 }
  22
  23 // update the style of the specified HWND to include or exclude BS_MULTILINE
  24 // depending on whether the label contains the new lines
  25 inline void UpdateMultilineStyle(HWND hwnd, const wxString& label)
  26 {
  27     // update BS_MULTILINE style depending on the new label (resetting it
  28     // doesn't seem to do anything very useful but it shouldn't hurt and we do
  29     // have to set it whenever the label becomes multi line as otherwise it
  30     // wouldn't be shown correctly as we don't use BS_MULTILINE when creating
  31     // the control unless it already has new lines in its label)
  32     long styleOld = ::GetWindowLong(hwnd, GWL_STYLE),
  33          styleNew;
  34     if ( label.find(_T('\n')) != wxString::npos )
  35         styleNew = styleOld | BS_MULTILINE;
  36     else
  37         styleNew = styleOld & ~BS_MULTILINE;
  38
  39     if ( styleNew != styleOld )
  40         ::SetWindowLong(hwnd, GWL_STYLE, styleNew);
  41 }
  42
  43 } // namespace wxMSWButton
  44
  45 #endif // _WX_MSW_PRIVATE_BUTTON_H_
  46